﻿/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2009 Frederico Caldeira Knabben
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses at your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * Active selection functions. (IE specific implementation)
 */

// Get the selection type.
FCKSelection.GetType = function()
{
    // It is possible that we can still get a text range object even when type=='None' is returned by IE.
    // So we'd better check the object returned by createRange() rather than by looking at the type.
    try
    {
        var ieType = FCKSelection.GetSelection().type ;
        if ( ieType == 'Control' || ieType == 'Text' )
            return ieType ;

        if ( this.GetSelection().createRange().parentElement )
            return 'Text' ;
    }
    catch(e)
    {
        // Nothing to do, it will return None properly.
    }

    return 'None' ;
} ;

// Retrieves the selected element (if any), just in the case that a single
// element (object like and image or a table) is selected.
FCKSelection.GetSelectedElement = function()
{
    if ( this.GetType() == 'Control' )
    {
        var oRange = this.GetSelection().createRange() ;

        if ( oRange && oRange.item )
            return this.GetSelection().createRange().item(0) ;
    }
    return null ;
} ;

FCKSelection.GetParentElement = function()
{
    switch ( this.GetType() )
    {
        case 'Control' :
            var el = FCKSelection.GetSelectedElement() ;
            return el ? el.parentElement : null ;

        case 'None' :
            return null ;

        default :
            return this.GetSelection().createRange().parentElement() ;
    }
} ;

FCKSelection.GetBoundaryParentElement = function( startBoundary )
{
    switch ( this.GetType() )
    {
        case 'Control' :
            var el = FCKSelection.GetSelectedElement() ;
            return el ? el.parentElement : null ;

        case 'None' :
            return null ;

        default :
            var doc = FCK.EditorDocument ;

            var range = doc.selection.createRange() ;
            range.collapse( startBoundary !== false ) ;

            var el = range.parentElement() ;

            // It may happen that range is comming from outside "doc", so we
            // must check it (#1204).
            return FCKTools.GetElementDocument( el ) == doc ? el : null ;
    }
} ;

FCKSelection.SelectNode = function( node )
{
    FCK.Focus() ;
    this.GetSelection().empty() ;
    var oRange ;
    try
    {
        // Try to select the node as a control.
        oRange = FCK.EditorDocument.body.createControlRange() ;
        oRange.addElement( node ) ;
    }
    catch(e)
    {
        // If failed, select it as a text range.
        oRange = FCK.EditorDocument.body.createTextRange() ;
        oRange.moveToElementText( node ) ;
    }

    oRange.select() ;
} ;

FCKSelection.Collapse = function( toStart )
{
    FCK.Focus() ;
    if ( this.GetType() == 'Text' )
    {
        var oRange = this.GetSelection().createRange() ;
        oRange.collapse( toStart == null || toStart === true ) ;
        oRange.select() ;
    }
} ;

// The "nodeTagName" parameter must be Upper Case.
FCKSelection.HasAncestorNode = function( nodeTagName )
{
    var oContainer ;

    if ( this.GetSelection().type == "Control" )
    {
        oContainer = this.GetSelectedElement() ;
    }
    else
    {
        var oRange  = this.GetSelection().createRange() ;
        oContainer = oRange.parentElement() ;
    }

    while ( oContainer )
    {
        if ( oContainer.nodeName.IEquals( nodeTagName ) ) return true ;
        oContainer = oContainer.parentNode ;
    }

    return false ;
} ;

// The "nodeTagName" parameter must be UPPER CASE.
// It can be also an array of names
FCKSelection.MoveToAncestorNode = function( nodeTagName )
{
    var oNode, oRange ;

    if ( ! FCK.EditorDocument )
        return null ;

    if ( this.GetSelection().type == "Control" )
    {
        oRange = this.GetSelection().createRange() ;
        for ( i = 0 ; i < oRange.length ; i++ )
        {
            if (oRange(i).parentNode)
            {
                oNode = oRange(i).parentNode ;
                break ;
            }
        }
    }
    else
    {
        oRange  = this.GetSelection().createRange() ;
        oNode = oRange.parentElement() ;
    }

    while ( oNode && !oNode.nodeName.Equals( nodeTagName ) )
        oNode = oNode.parentNode ;

    return oNode ;
} ;

FCKSelection.Delete = function()
{
    // Gets the actual selection.
    var oSel = this.GetSelection() ;

    // Deletes the actual selection contents.
    if ( oSel.type.toLowerCase() != "none" )
    {
        oSel.clear() ;
    }

    return oSel ;
} ;

/**
 * Returns the native selection object.
 */
FCKSelection.GetSelection = function()
{
    this.Restore() ;
    return FCK.EditorDocument.selection ;
}

FCKSelection.Save = function( lock )
{
    var editorDocument = FCK.EditorDocument ;

    if ( !editorDocument )
        return ;

    // Avoid saving again a selection while a dialog is open #2616
    if ( this.locked )
        return ;
    this.locked = !!lock ;

    var selection = editorDocument.selection ;
    var range ;

    if ( selection )
    {
        // The call might fail if the document doesn't have the focus (#1801),
        // but we don't want to modify the current selection (#2495) with a call to FCK.Focus() ;
        try {
            range = selection.createRange() ;
        }
        catch(e) {}

        // Ensure that the range comes from the editor document.
        if ( range )
        {
            if ( range.parentElement && FCKTools.GetElementDocument( range.parentElement() ) != editorDocument )
                range = null ;
            else if ( range.item && FCKTools.GetElementDocument( range.item(0) )!= editorDocument )
                range = null ;
        }
    }

    this.SelectionData = range ;
}

FCKSelection._GetSelectionDocument = function( selection )
{
    var range = selection.createRange() ;
    if ( !range )
        return null;
    else if ( range.item )
        return FCKTools.GetElementDocument( range.item( 0 ) ) ;
    else
        return FCKTools.GetElementDocument( range.parentElement() ) ;
}

FCKSelection.Restore = function()
{
    if ( this.SelectionData )
    {
        FCK.IsSelectionChangeLocked = true ;

        try
        {
            // Don't repeat the restore process if the editor document is already selected.
            if ( String( this._GetSelectionDocument( FCK.EditorDocument.selection ).body.contentEditable ) == 'true' )
            {
                FCK.IsSelectionChangeLocked = false ;
                return ;
            }
            this.SelectionData.select() ;
        }
        catch ( e ) {}

        FCK.IsSelectionChangeLocked = false ;
    }
}

FCKSelection.Release = function()
{
    this.locked = false ;
    delete this.SelectionData ;
}
